{"gene":"ZC3HAV1","run_date":"2026-06-11T09:02:06","timeline":{"discoveries":[{"year":2013,"finding":"S-farnesylation of the long isoform of ZAP (ZAPL) is required for its targeting to endolysosomes and enhances its antiviral activity; bioorthogonal proteomics with alkyne-isoprenoid chemical reporters identified this isoform-specific lipid modification.","method":"Bioorthogonal proteomics (alkyne-isoprenoid chemical reporters), subcellular fractionation/imaging, functional antiviral assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — chemical reporter-based proteomics identifying the modification, combined with localization imaging and antiviral functional assay in a single rigorous study","pmids":["23776219"],"is_preprint":false},{"year":2014,"finding":"PARP13/ZAP binds cellular mRNAs via its four CCCH-type zinc-finger domains and destabilizes the TRAILR4 transcript post-transcriptionally in an exosome-dependent manner by binding to a region in its 3' UTR, thereby repressing TRAILR4 expression and increasing cell sensitivity to TRAIL-mediated apoptosis.","method":"RNA immunoprecipitation, knockdown (siRNA), RNA stability assay, luciferase reporter assay, exosome inhibition","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (RIP, KD, stability assay, reporter assay) in single lab establishing direct binding and functional consequence","pmids":["25382312"],"is_preprint":false},{"year":2013,"finding":"ZAP acts as a cytosolic RNA sensor that recruits viral (MLV) transcripts and exosome components to RNA granules, inducing viral RNA degradation by the exosome; this function requires the CCCH-type zinc-finger domains of ZAP. ZAP deficiency did not affect RIG-I-dependent type I IFN production in mouse cells.","method":"Genetic knockout (ZAP-deficient mice/cells), viral replication assay, co-localization microscopy, domain mutant analysis, RNA granule fractionation","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic KO with clear viral replication phenotype, domain mutagenesis, and co-localization, multiple orthogonal methods","pmids":["23836649"],"is_preprint":false},{"year":2015,"finding":"ZAP interacts with LINE-1 ORF1p in an RNA-dependent manner and inhibits retrotransposition of human L1, Alu, mouse L1, and zebrafish LINE-2 elements by reducing accumulation of full-length L1 RNA and L1-encoded proteins; ZAP co-localizes with L1 RNA and ORF1p in cytoplasmic stress granule foci.","method":"Co-immunoprecipitation with mass spectrometry, siRNA knockdown, retrotransposition assay (cell culture), fluorescence microscopy","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated across two independent labs (PMIDs 25951186 and 26001115), Co-IP/MS, KD, retrotransposition assay, and microscopy","pmids":["25951186","26001115"],"is_preprint":false},{"year":2015,"finding":"ZAP (PARP13/ZC3HAV1) restricts L1 retrotransposition through loss of L1 RNA and ribonucleoprotein particle integrity; ZAP co-immunoprecipitates with ORF1p and co-localizes in cytoplasmic stress granules. Mass spectrometry of the ZAP interactome identified associated proteins including MOV10 RNA helicase, RNA degradation proteins, helicases, and chaperonin complex components.","method":"Co-immunoprecipitation, mass spectrometry (ZAP interactome), retrotransposition assay, fluorescence microscopy","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — replicated findings from independent lab (PMID 25951186), reciprocal Co-IP and MS interactome plus functional retrotransposition assay","pmids":["26001115"],"is_preprint":false},{"year":2012,"finding":"Poly(ADP-ribose) (pADPr) functions are mediated in the cytoplasm through catalytically inactive PARP-13/ZC3HAV1 together with mono/poly(ADP-ribose)-synthesizing enzymes; PARP-13 participates in cytoplasmic stress granule assembly and modulation of microRNA activities.","method":"Biochemical fractionation, pADPr modification assay, stress granule assembly assay","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — biochemical evidence for cytoplasmic pADPr functions involving ZAP, but abstract does not detail rigorous mechanistic dissection of ZAP's specific contribution","pmids":["22531498"],"is_preprint":false},{"year":2021,"finding":"ZAP/ZC3HAV1 directly binds SARS-CoV-2 RNA (identified by RNP capture) and functions as an antiviral RBP; knockdown experiments confirmed its antiviral role in coronavirus replication.","method":"RNP capture (ribonucleoprotein capture protocol), siRNA knockdown, transcriptome analysis","journal":"Molecular cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA-binding shown by RNP capture, KD with functional readout, but ZC3HAV1 is one of many factors in a broader screen","pmids":["33989516"],"is_preprint":false},{"year":2021,"finding":"ZAP (both ZAP-S and ZAP-L isoforms) restricts HCMV replication by destabilizing a distinct subset of viral mRNAs, particularly UL4 and UL5 transcripts from the UL4-UL6 locus; eCLIP-seq identified these as direct ZAP binding targets. ZAP preferentially recognizes CG-rich sequences and other cytosine-rich sequences.","method":"Enhanced cross-linking immunoprecipitation and sequencing (eCLIP-seq), SLAM-seq (metabolic RNA labeling + sequencing), transcriptome and proteome analysis, ZAP overexpression","journal":"mBio","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — direct ZAP-RNA binding identified by eCLIP-seq, combined with SLAM-seq and functional restriction assay in a single rigorous study","pmids":["33947766"],"is_preprint":false},{"year":2019,"finding":"ZAP suppresses HTLV-1 viral transcript levels in a dose-dependent manner; overexpression of ZAP reduced virus production and siRNA knockdown of endogenous ZAP increased virus production. HTLV-1's high CG dinucleotide content is associated with susceptibility to ZAP-mediated restriction.","method":"ZAP overexpression, siRNA knockdown, virus production assay (CAGE sequencing for transcript analysis)","journal":"Retrovirology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal gain- and loss-of-function (OE and KD with two independent siRNAs) with viral production readout in a single lab","pmids":["31842935"],"is_preprint":false},{"year":2020,"finding":"ZC3HAV1 is induced by IFN-β/IFNAR signaling during influenza A virus (IAV) and Sendai virus infection; knockdown of ZC3HAV1 enhanced IAV replication by impairing IFN-β and MxA production, while overexpression of ZC3HAV1 restricted IAV replication by increasing IFN-β expression and promoting TNF and IL-6 induction.","method":"siRNA knockdown, ectopic overexpression, viral replication assay, cytokine measurement, IFNAR deficiency (genetic)","journal":"Frontiers in microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal KD/OE with defined molecular phenotype (IFN-β, MxA) and viral replication readout, single lab","pmids":["32922375"],"is_preprint":false},{"year":2024,"finding":"ZC3HAV1 (ZAP) potentiates STING activation by directly associating with STING protein to promote its oligomerization and translocation from the ER to the Golgi, facilitating downstream IRF3 and NF-κB pathway activation; Zc3hav1-deficient mice show reduced inflammation upon HSV-1 infection or DMXAA treatment in a STING-dependent manner.","method":"Co-immunoprecipitation, STING oligomerization assay, ER-to-Golgi translocation assay, genetic KO (Zc3hav1-deficient mice), in vivo infection model, IRF3/NF-κB pathway activation assay","journal":"Communications biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP showing direct ZAP-STING interaction, oligomerization and translocation assays, genetic KO in vivo, multiple orthogonal methods in single study","pmids":["39478149"],"is_preprint":false},{"year":2024,"finding":"ZAP/ZC3HAV1 interacts with NLRP3 and promotes NLRP3 oligomerization, thereby facilitating NLRP3 inflammasome activation in macrophages; the shorter isoform ZAPS shows greater activity than ZAPL in this context. Zap-deficient mice show reduced susceptibility to alum-induced peritonitis and LPS-induced sepsis.","method":"Co-immunoprecipitation, NLRP3 oligomerization assay, inflammasome activation assay, Zap-deficient mouse model (peritonitis and sepsis in vivo)","journal":"International immunopharmacology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP showing direct ZAP-NLRP3 interaction, oligomerization assay, and genetic KO in vivo with defined inflammatory phenotype, multiple orthogonal methods","pmids":["38663314"],"is_preprint":false},{"year":2023,"finding":"ZC3HAV1 dampens and shortens cytokine (IFNG, TNF, IL2) production duration in human T cells by binding to their 3' UTRs; RNA aptamer-based capture assay identified ZC3HAV1 as one of >130 RBPs interacting with cytokine 3' UTRs, with its interaction showing plasticity upon T cell activation.","method":"RNA aptamer-based capture assay, RBP-RNA interaction mapping, T cell activation assay, cytokine production measurement","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct binding shown by aptamer capture, functional phenotype demonstrated, but ZC3HAV1 is one of many factors in a broader screen in a single lab","pmids":["37074914"],"is_preprint":false},{"year":2021,"finding":"ZC3HAV1 was identified as an interaction partner of SARS-CoV-2 nucleocapsid (N) protein by affinity purification and mass spectrometry in HEK293T and Calu-3 cells.","method":"Affinity purification and mass spectrometry (AP-MS)","journal":"Pathogens (Basel, Switzerland)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single AP-MS identification of ZC3HAV1 as N protein interactor in a broad interactome survey, no functional follow-up on ZC3HAV1 specifically","pmids":["34578187"],"is_preprint":false},{"year":2023,"finding":"ZCCHC3 associates with ZC3HAV1/ZAP as demonstrated by co-immunoprecipitation; collectively, evidence from subcellular localization, Co-IP, and velocity gradient centrifugation links both proteins to the RNA exosome complex for retrotransposon control.","method":"Co-immunoprecipitation, velocity gradient centrifugation, co-localization microscopy","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and multiple orthogonal methods, but mechanistic role of ZC3HAV1 specifically (vs. ZCCHC3) is not the primary focus","pmids":["37405998"],"is_preprint":false},{"year":2023,"finding":"KHNYN's nuclear export signal (NES) in its CUBAN domain is required for its cytoplasmic localization and interaction with ZAP; deletion or mutation of the NES increased KHNYN nuclear localization and decreased its interaction with ZAP, reducing antiviral activity against retroviruses.","method":"Co-immunoprecipitation, subcellular localization assay, antiviral activity assay, CUBAN domain deletion and NES mutagenesis","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct ZAP-KHNYN interaction demonstrated by Co-IP with loss-of-function mutagenesis linking localization to interaction and antiviral activity","pmids":["36633408"],"is_preprint":false},{"year":2025,"finding":"Porcine ZAP long isoform (pZAPL), encoded by ZC3HAV1, inhibits PCV2 replication by targeting ORF1, ORF2 and ORF3 mRNAs; dual luciferase and RNA immunoprecipitation analyses confirmed direct binding to these viral mRNAs and showed pZAPL overexpression impacts their mRNA stability. pZAPL shows stronger antiviral activity than pZAPS against PCV2.","method":"Dual luciferase reporter assay, RNA immunoprecipitation, mRNA stability assay, overexpression","journal":"Veterinary microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA-binding shown by RIP, reporter assay and mRNA stability, but porcine ortholog study from a single lab","pmids":["41076738"],"is_preprint":false},{"year":2021,"finding":"ZC3HAV1 directly binds to KRAS by immunoprecipitation and positively regulates KRAS expression, activating the MAPK signaling pathway (increasing p-ERK levels); knockdown of KRAS attenuated ZC3HAV1-mediated promotion of proliferation and invasion in pancreatic cancer cells.","method":"Co-immunoprecipitation, siRNA knockdown (KRAS), overexpression, Western blot (p-ERK), cell proliferation and invasion assay","journal":"Aging","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP from one lab with functional epistasis, but the mechanistic basis of KRAS regulation by ZC3HAV1 is not established and the finding is unexpected given ZC3HAV1's known RNA-binding function","pmids":["34319912"],"is_preprint":false}],"current_model":"ZC3HAV1/ZAP is a CCCH-type zinc-finger RNA-binding protein that functions as a broad-spectrum antiviral restriction factor by directly binding CpG/cytosine-rich sequences in viral RNA and targeting them for degradation via the RNA exosome; the long isoform (ZAPL) is S-farnesylated and localizes to endolysosomes, while the short isoform (ZAPS) is a potent stimulator of RIG-I and STING signaling; ZAP recruits cofactors including KHNYN (an endoribonuclease) and associates with RNA granules/stress granules to execute antiviral RNA decay; beyond antiviral roles, ZAP regulates endogenous cellular mRNAs (e.g., destabilizing TRAILR4 to promote apoptosis and dampening cytokine production in T cells), inhibits LINE-1 and Alu retrotransposition, promotes NLRP3 inflammasome activation by facilitating NLRP3 oligomerization, and potentiates STING signaling by promoting STING oligomerization and ER-to-Golgi translocation."},"narrative":{"mechanistic_narrative":"ZC3HAV1 (ZAP/PARP13) is a CCCH-type zinc-finger RNA-binding protein that acts as a broad-spectrum cytosolic antiviral restriction factor and a regulator of endogenous RNA fate [PMID:23836649, PMID:25382312]. It directly binds viral and cellular transcripts through its four CCCH zinc-finger domains, preferentially recognizing CG- and cytosine-rich sequences, and targets bound RNA for exosome-dependent degradation [PMID:33947766, PMID:23836649]. This activity restricts diverse viruses including murine leukemia virus, SARS-CoV-2, HCMV, HTLV-1, and (for the porcine ortholog) PCV2, in each case by destabilizing specific viral mRNAs [PMID:23836649, PMID:33989516, PMID:33947766, PMID:31842935, PMID:41076738]. ZAP localizes to cytoplasmic RNA/stress granules where it recruits exosome components and RNA-degradation machinery, and it inhibits LINE-1 and Alu retrotransposition by binding ORF1p in an RNA-dependent manner and degrading L1 RNA [PMID:23836649, PMID:25951186, PMID:26001115]. Antiviral and decay functions depend on cofactor recruitment: ZAP interacts with the endonuclease KHNYN, whose cytoplasmic localization via its CUBAN-domain NES is required for the ZAP interaction and antiviral activity [PMID:36633408], and associates with ZCCHC3 in linking the complex to the RNA exosome [PMID:37405998]. The two isoforms are functionally specialized: the long isoform is S-farnesylated and targeted to endolysosomes, enhancing antiviral activity [PMID:23776219]. Beyond viral defense, ZAP regulates endogenous mRNAs—destabilizing TRAILR4 to sensitize cells to TRAIL-mediated apoptosis [PMID:25382312] and dampening cytokine (IFNG/TNF/IL2) production in T cells through 3' UTR binding [PMID:37074914]—and it potentiates innate immune signaling by directly associating with STING to promote its oligomerization and ER-to-Golgi translocation [PMID:39478149] and with NLRP3 to promote inflammasome activation [PMID:38663314].","teleology":[{"year":2012,"claim":"Established that catalytically inactive PARP-13/ZAP participates in cytoplasmic poly(ADP-ribose) functions and stress granule assembly, placing ZAP in the cytoplasmic RNA-regulatory compartment.","evidence":"Biochemical fractionation, pADPr modification and stress granule assembly assays","pmids":["22531498"],"confidence":"Medium","gaps":["ZAP's specific molecular contribution within pADPr functions not dissected","no direct RNA target identified"]},{"year":2013,"claim":"Defined ZAP's core antiviral mechanism: it acts as a cytosolic sensor that recruits viral RNA and exosome components to RNA granules for degradation, requiring its CCCH zinc-finger domains and operating independently of RIG-I-dependent IFN.","evidence":"ZAP-deficient mouse cells, viral replication assays, domain mutagenesis, co-localization, RNA granule fractionation","pmids":["23836649"],"confidence":"High","gaps":["sequence determinants of viral RNA recognition not yet defined","identity of exosome-recruiting cofactors unresolved"]},{"year":2013,"claim":"Showed isoform-specific lipid modification controls ZAP localization: S-farnesylation of the long isoform targets it to endolysosomes and enhances antiviral activity, establishing ZAPL/ZAPS functional divergence.","evidence":"Bioorthogonal proteomics with alkyne-isoprenoid reporters, subcellular imaging, antiviral assay","pmids":["23776219"],"confidence":"High","gaps":["how endolysosomal targeting mechanistically enhances RNA decay unclear","structural basis of farnesylation-dependent membrane association not defined"]},{"year":2014,"claim":"Extended ZAP function to endogenous mRNA regulation by showing direct zinc-finger-mediated binding to the TRAILR4 3' UTR drives exosome-dependent decay, sensitizing cells to TRAIL apoptosis.","evidence":"RIP, siRNA knockdown, RNA stability and luciferase reporter assays, exosome inhibition","pmids":["25382312"],"confidence":"High","gaps":["full set of endogenous mRNA targets not mapped","cis-element recognized within the 3' UTR not defined at nucleotide resolution"]},{"year":2015,"claim":"Demonstrated ZAP restricts retrotransposition of L1, Alu and related elements by binding ORF1p in an RNA-dependent manner, degrading L1 RNA, and disrupting ribonucleoprotein integrity, with an interactome including MOV10 and RNA-degradation/chaperonin proteins.","evidence":"Co-IP/MS interactome, siRNA knockdown, retrotransposition assays, fluorescence microscopy (replicated across two labs)","pmids":["25951186","26001115"],"confidence":"High","gaps":["which interactome partners are functionally required not established","mechanism distinguishing RNA decay vs. RNP disassembly unresolved"]},{"year":2019,"claim":"Linked ZAP restriction to viral CG dinucleotide content using HTLV-1, supporting sequence-biased recognition as a restriction determinant.","evidence":"ZAP overexpression and siRNA knockdown, virus production assay, CAGE sequencing","pmids":["31842935"],"confidence":"Medium","gaps":["direct ZAP binding to HTLV-1 RNA not shown","causal link between CG content and degradation not directly tested"]},{"year":2020,"claim":"Positioned ZC3HAV1 within the IFN circuit, showing it is IFN-induced and reciprocally amplifies IFN-β and inflammatory cytokine production to restrict IAV.","evidence":"siRNA knockdown, overexpression, viral replication and cytokine assays, IFNAR-deficient cells","pmids":["32922375"],"confidence":"Medium","gaps":["mechanism by which ZAP boosts IFN-β production not defined","direct viral RNA target in IAV not identified"]},{"year":2021,"claim":"Confirmed direct binding to viral RNA at transcriptome scale: ZAP binds SARS-CoV-2 RNA and, via eCLIP, binds CG/cytosine-rich HCMV transcripts (UL4/UL5) it destabilizes, defining its sequence preference.","evidence":"RNP capture, eCLIP-seq, SLAM-seq, knockdown/overexpression with transcriptome and proteome readouts","pmids":["33989516","33947766"],"confidence":"High","gaps":["structural basis of CG-rich recognition not resolved","why only a subset of CG-rich transcripts is targeted unclear"]},{"year":2023,"claim":"Resolved cofactor recruitment requirements, showing KHNYN's cytoplasmic localization (via its CUBAN-domain NES) is required for ZAP interaction and antiviral activity, and that ZCCHC3 associates with ZAP linking the complex to the RNA exosome.","evidence":"Co-IP, NES/CUBAN mutagenesis, subcellular localization, velocity gradient centrifugation, antiviral assays","pmids":["36633408","37405998"],"confidence":"Medium","gaps":["stoichiometry and architecture of the ZAP-KHNYN-ZCCHC3-exosome assembly unknown","whether KHNYN provides endonucleolytic cleavage in this complex not directly shown here"]},{"year":2023,"claim":"Broadened endogenous regulation to immune effector control, showing ZC3HAV1 binds cytokine (IFNG/TNF/IL2) 3' UTRs and dampens cytokine production duration in activated T cells.","evidence":"RNA aptamer-based capture, RBP-RNA mapping, T cell activation and cytokine assays","pmids":["37074914"],"confidence":"Medium","gaps":["ZC3HAV1 one of >130 RBPs in the screen; specific contribution partly correlative","decay vs. translational mechanism on cytokine mRNAs not separated"]},{"year":2024,"claim":"Revealed signaling-scaffold roles beyond RNA decay: ZAP directly promotes STING oligomerization and ER-to-Golgi translocation, and promotes NLRP3 oligomerization to drive inflammasome activation, with deficient mice showing reduced inflammation in vivo.","evidence":"Co-IP, oligomerization and translocation assays, Zc3hav1/Zap-deficient mice in HSV-1/DMXAA, alum peritonitis, and LPS sepsis models","pmids":["39478149","38663314"],"confidence":"High","gaps":["how an RNA-binding protein mechanistically nucleates STING/NLRP3 oligomerization unclear","whether these protein-scaffolding roles require RNA binding not resolved"]},{"year":null,"claim":"How ZAP integrates its dual identity—sequence-specific RNA-decay factor versus protein-protein scaffold for innate immune oligomerization—into a unified mechanism, and the structural basis of CG-rich RNA recognition, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["no structural model of ZAP-RNA recognition","relationship between RNA-binding and scaffolding functions undefined","rules governing which transcripts (viral vs. endogenous) are selected unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[1,2,6,7,16]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[1,2,7]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[10,11]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,3,4]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[9,10,11,12]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[1,2,7]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[10,11]}],"complexes":["RNA exosome (associated)"],"partners":["KHNYN","ZCCHC3","MOV10","LINE-1 ORF1P","STING1","NLRP3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7Z2W4","full_name":"Zinc finger CCCH-type antiviral protein 1","aliases":["ADP-ribosyltransferase diphtheria toxin-like 13","ARTD13","Inactive Poly [ADP-ribose] polymerase 13","PARP13","Zinc finger CCCH domain-containing protein 2","Zinc finger antiviral protein","ZAP"],"length_aa":902,"mass_kda":101.4,"function":"Antiviral protein which inhibits the replication of viruses by recruiting the cellular RNA degradation machineries to degrade the viral mRNAs. Binds to a ZAP-responsive element (ZRE) present in the target viral mRNA, recruits cellular poly(A)-specific ribonuclease PARN to remove the poly(A) tail, and the 3'-5' exoribonuclease complex exosome to degrade the RNA body from the 3'-end. It also recruits the decapping complex DCP1-DCP2 through RNA helicase p72 (DDX17) to remove the cap structure of the viral mRNA to initiate its degradation from the 5'-end. Its target viruses belong to families which include retroviridae, including human immunodeficiency virus type 1, filoviridae: ebola virus (EBOV) and marburg virus (MARV), togaviridae: sindbis virus (SINV) and Ross river virus (RRV). Specifically targets the multiply spliced but not unspliced or singly spliced HIV-1 mRNAs for degradation Exhibits stronger antiviral activity than isoform 2 against MuLV expression and Semliki forest virus infection (PubMed:18225958). Increased antiviral activity may be due to more efficient targeting to endocytic membranes through S-farnesylation (By similarity). Similarly to isoform 2, prevents HIV-1 infection (PubMed:21876179) Positive regulator of RIGI signaling during the innate antiviral immune response. Associates with RIGI to promote its oligomerization and ATPase activity stimulation, leading to robust activation of IRF3 and NF-kappa-B transcription factors and eventually to the expression of type I IFNs and IFN stimulated genes (ISGs) (PubMed:21102435). Similarly to isoform 1, prevents HIV-1 infection (PubMed:21876179)","subcellular_location":"Nucleus; Cytoplasm; Membrane","url":"https://www.uniprot.org/uniprotkb/Q7Z2W4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ZC3HAV1","classification":"Not Classified","n_dependent_lines":14,"n_total_lines":1208,"dependency_fraction":0.011589403973509934},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DDOST","stoichiometry":0.2},{"gene":"DHX9","stoichiometry":0.2},{"gene":"OST4","stoichiometry":0.2},{"gene":"RPN1","stoichiometry":0.2},{"gene":"RPN2","stoichiometry":0.2},{"gene":"SSB","stoichiometry":0.2},{"gene":"STT3B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ZC3HAV1","total_profiled":1310},"omim":[{"mim_id":"619579","title":"KH DOMAIN- AND NYN DOMAIN-CONTAINING PROTEIN; KHNYN","url":"https://www.omim.org/entry/619579"},{"mim_id":"616423","title":"DExH-BOX HELICASE 30; DHX30","url":"https://www.omim.org/entry/616423"},{"mim_id":"615001","title":"ZINC FINGER CCCH DOMAIN-CONTAINING PROTEIN 12C; ZC3H12C","url":"https://www.omim.org/entry/615001"},{"mim_id":"612481","title":"POLY(ADP-RIBOSE) POLYMERASE FAMILY, MEMBER 12; PARP12","url":"https://www.omim.org/entry/612481"},{"mim_id":"612480","title":"TCDD-INDUCIBLE POLY(ADP-RIBOSE) POLYMERASE; TIPARP","url":"https://www.omim.org/entry/612480"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Golgi apparatus","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":81.0}],"url":"https://www.proteinatlas.org/search/ZC3HAV1"},"hgnc":{"alias_symbol":["ZAP","FLB6421","FLJ13288","MGC48898","ZC3HDC2","ZC3H2","PARP13","ARTD13"],"prev_symbol":[]},"alphafold":{"accession":"Q7Z2W4","domains":[{"cath_id":"1.10.10.10","chopping":"5-67","consensus_level":"medium","plddt":88.3029,"start":5,"end":67},{"cath_id":"3.30.720.50","chopping":"608-690","consensus_level":"medium","plddt":86.5964,"start":608,"end":690},{"cath_id":"3.90.228.10","chopping":"730-896","consensus_level":"high","plddt":92.2232,"start":730,"end":896}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z2W4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z2W4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z2W4-F1-predicted_aligned_error_v6.png","plddt_mean":69.44},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ZC3HAV1","jax_strain_url":"https://www.jax.org/strain/search?query=ZC3HAV1"},"sequence":{"accession":"Q7Z2W4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q7Z2W4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q7Z2W4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z2W4"}},"corpus_meta":[{"pmid":"33989516","id":"PMC_33989516","title":"The SARS-CoV-2 RNA interactome.","date":"2021","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/33989516","citation_count":132,"is_preprint":false},{"pmid":"25951186","id":"PMC_25951186","title":"The Zinc-Finger Antiviral Protein ZAP Inhibits LINE and Alu Retrotransposition.","date":"2015","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/25951186","citation_count":123,"is_preprint":false},{"pmid":"26001115","id":"PMC_26001115","title":"The Broad-Spectrum Antiviral Protein ZAP Restricts Human Retrotransposition.","date":"2015","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26001115","citation_count":114,"is_preprint":false},{"pmid":"23776219","id":"PMC_23776219","title":"Prenylome profiling reveals S-farnesylation is crucial for membrane targeting and antiviral activity of ZAP long-isoform.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of 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ZAP deficiency did not affect RIG-I-dependent type I IFN production in mouse cells.\",\n      \"method\": \"Genetic knockout (ZAP-deficient mice/cells), viral replication assay, co-localization microscopy, domain mutant analysis, RNA granule fractionation\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with clear viral replication phenotype, domain mutagenesis, and co-localization, multiple orthogonal methods\",\n      \"pmids\": [\"23836649\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ZAP interacts with LINE-1 ORF1p in an RNA-dependent manner and inhibits retrotransposition of human L1, Alu, mouse L1, and zebrafish LINE-2 elements by reducing accumulation of full-length L1 RNA and L1-encoded proteins; ZAP co-localizes with L1 RNA and ORF1p in cytoplasmic stress granule foci.\",\n      \"method\": \"Co-immunoprecipitation with mass spectrometry, siRNA knockdown, retrotransposition assay (cell culture), fluorescence microscopy\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated across two independent labs (PMIDs 25951186 and 26001115), Co-IP/MS, KD, retrotransposition assay, and microscopy\",\n      \"pmids\": [\"25951186\", \"26001115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ZAP (PARP13/ZC3HAV1) restricts L1 retrotransposition through loss of L1 RNA and ribonucleoprotein particle integrity; ZAP co-immunoprecipitates with ORF1p and co-localizes in cytoplasmic stress granules. Mass spectrometry of the ZAP interactome identified associated proteins including MOV10 RNA helicase, RNA degradation proteins, helicases, and chaperonin complex components.\",\n      \"method\": \"Co-immunoprecipitation, mass spectrometry (ZAP interactome), retrotransposition assay, fluorescence microscopy\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — replicated findings from independent lab (PMID 25951186), reciprocal Co-IP and MS interactome plus functional retrotransposition assay\",\n      \"pmids\": [\"26001115\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Poly(ADP-ribose) (pADPr) functions are mediated in the cytoplasm through catalytically inactive PARP-13/ZC3HAV1 together with mono/poly(ADP-ribose)-synthesizing enzymes; PARP-13 participates in cytoplasmic stress granule assembly and modulation of microRNA activities.\",\n      \"method\": \"Biochemical fractionation, pADPr modification assay, stress granule assembly assay\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — biochemical evidence for cytoplasmic pADPr functions involving ZAP, but abstract does not detail rigorous mechanistic dissection of ZAP's specific contribution\",\n      \"pmids\": [\"22531498\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZAP/ZC3HAV1 directly binds SARS-CoV-2 RNA (identified by RNP capture) and functions as an antiviral RBP; knockdown experiments confirmed its antiviral role in coronavirus replication.\",\n      \"method\": \"RNP capture (ribonucleoprotein capture protocol), siRNA knockdown, transcriptome analysis\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA-binding shown by RNP capture, KD with functional readout, but ZC3HAV1 is one of many factors in a broader screen\",\n      \"pmids\": [\"33989516\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZAP (both ZAP-S and ZAP-L isoforms) restricts HCMV replication by destabilizing a distinct subset of viral mRNAs, particularly UL4 and UL5 transcripts from the UL4-UL6 locus; eCLIP-seq identified these as direct ZAP binding targets. ZAP preferentially recognizes CG-rich sequences and other cytosine-rich sequences.\",\n      \"method\": \"Enhanced cross-linking immunoprecipitation and sequencing (eCLIP-seq), SLAM-seq (metabolic RNA labeling + sequencing), transcriptome and proteome analysis, ZAP overexpression\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — direct ZAP-RNA binding identified by eCLIP-seq, combined with SLAM-seq and functional restriction assay in a single rigorous study\",\n      \"pmids\": [\"33947766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ZAP suppresses HTLV-1 viral transcript levels in a dose-dependent manner; overexpression of ZAP reduced virus production and siRNA knockdown of endogenous ZAP increased virus production. HTLV-1's high CG dinucleotide content is associated with susceptibility to ZAP-mediated restriction.\",\n      \"method\": \"ZAP overexpression, siRNA knockdown, virus production assay (CAGE sequencing for transcript analysis)\",\n      \"journal\": \"Retrovirology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal gain- and loss-of-function (OE and KD with two independent siRNAs) with viral production readout in a single lab\",\n      \"pmids\": [\"31842935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ZC3HAV1 is induced by IFN-β/IFNAR signaling during influenza A virus (IAV) and Sendai virus infection; knockdown of ZC3HAV1 enhanced IAV replication by impairing IFN-β and MxA production, while overexpression of ZC3HAV1 restricted IAV replication by increasing IFN-β expression and promoting TNF and IL-6 induction.\",\n      \"method\": \"siRNA knockdown, ectopic overexpression, viral replication assay, cytokine measurement, IFNAR deficiency (genetic)\",\n      \"journal\": \"Frontiers in microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal KD/OE with defined molecular phenotype (IFN-β, MxA) and viral replication readout, single lab\",\n      \"pmids\": [\"32922375\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZC3HAV1 (ZAP) potentiates STING activation by directly associating with STING protein to promote its oligomerization and translocation from the ER to the Golgi, facilitating downstream IRF3 and NF-κB pathway activation; Zc3hav1-deficient mice show reduced inflammation upon HSV-1 infection or DMXAA treatment in a STING-dependent manner.\",\n      \"method\": \"Co-immunoprecipitation, STING oligomerization assay, ER-to-Golgi translocation assay, genetic KO (Zc3hav1-deficient mice), in vivo infection model, IRF3/NF-κB pathway activation assay\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP showing direct ZAP-STING interaction, oligomerization and translocation assays, genetic KO in vivo, multiple orthogonal methods in single study\",\n      \"pmids\": [\"39478149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ZAP/ZC3HAV1 interacts with NLRP3 and promotes NLRP3 oligomerization, thereby facilitating NLRP3 inflammasome activation in macrophages; the shorter isoform ZAPS shows greater activity than ZAPL in this context. Zap-deficient mice show reduced susceptibility to alum-induced peritonitis and LPS-induced sepsis.\",\n      \"method\": \"Co-immunoprecipitation, NLRP3 oligomerization assay, inflammasome activation assay, Zap-deficient mouse model (peritonitis and sepsis in vivo)\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP showing direct ZAP-NLRP3 interaction, oligomerization assay, and genetic KO in vivo with defined inflammatory phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"38663314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZC3HAV1 dampens and shortens cytokine (IFNG, TNF, IL2) production duration in human T cells by binding to their 3' UTRs; RNA aptamer-based capture assay identified ZC3HAV1 as one of >130 RBPs interacting with cytokine 3' UTRs, with its interaction showing plasticity upon T cell activation.\",\n      \"method\": \"RNA aptamer-based capture assay, RBP-RNA interaction mapping, T cell activation assay, cytokine production measurement\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct binding shown by aptamer capture, functional phenotype demonstrated, but ZC3HAV1 is one of many factors in a broader screen in a single lab\",\n      \"pmids\": [\"37074914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZC3HAV1 was identified as an interaction partner of SARS-CoV-2 nucleocapsid (N) protein by affinity purification and mass spectrometry in HEK293T and Calu-3 cells.\",\n      \"method\": \"Affinity purification and mass spectrometry (AP-MS)\",\n      \"journal\": \"Pathogens (Basel, Switzerland)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single AP-MS identification of ZC3HAV1 as N protein interactor in a broad interactome survey, no functional follow-up on ZC3HAV1 specifically\",\n      \"pmids\": [\"34578187\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ZCCHC3 associates with ZC3HAV1/ZAP as demonstrated by co-immunoprecipitation; collectively, evidence from subcellular localization, Co-IP, and velocity gradient centrifugation links both proteins to the RNA exosome complex for retrotransposon control.\",\n      \"method\": \"Co-immunoprecipitation, velocity gradient centrifugation, co-localization microscopy\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and multiple orthogonal methods, but mechanistic role of ZC3HAV1 specifically (vs. ZCCHC3) is not the primary focus\",\n      \"pmids\": [\"37405998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"KHNYN's nuclear export signal (NES) in its CUBAN domain is required for its cytoplasmic localization and interaction with ZAP; deletion or mutation of the NES increased KHNYN nuclear localization and decreased its interaction with ZAP, reducing antiviral activity against retroviruses.\",\n      \"method\": \"Co-immunoprecipitation, subcellular localization assay, antiviral activity assay, CUBAN domain deletion and NES mutagenesis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct ZAP-KHNYN interaction demonstrated by Co-IP with loss-of-function mutagenesis linking localization to interaction and antiviral activity\",\n      \"pmids\": [\"36633408\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Porcine ZAP long isoform (pZAPL), encoded by ZC3HAV1, inhibits PCV2 replication by targeting ORF1, ORF2 and ORF3 mRNAs; dual luciferase and RNA immunoprecipitation analyses confirmed direct binding to these viral mRNAs and showed pZAPL overexpression impacts their mRNA stability. pZAPL shows stronger antiviral activity than pZAPS against PCV2.\",\n      \"method\": \"Dual luciferase reporter assay, RNA immunoprecipitation, mRNA stability assay, overexpression\",\n      \"journal\": \"Veterinary microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA-binding shown by RIP, reporter assay and mRNA stability, but porcine ortholog study from a single lab\",\n      \"pmids\": [\"41076738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZC3HAV1 directly binds to KRAS by immunoprecipitation and positively regulates KRAS expression, activating the MAPK signaling pathway (increasing p-ERK levels); knockdown of KRAS attenuated ZC3HAV1-mediated promotion of proliferation and invasion in pancreatic cancer cells.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown (KRAS), overexpression, Western blot (p-ERK), cell proliferation and invasion assay\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP from one lab with functional epistasis, but the mechanistic basis of KRAS regulation by ZC3HAV1 is not established and the finding is unexpected given ZC3HAV1's known RNA-binding function\",\n      \"pmids\": [\"34319912\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ZC3HAV1/ZAP is a CCCH-type zinc-finger RNA-binding protein that functions as a broad-spectrum antiviral restriction factor by directly binding CpG/cytosine-rich sequences in viral RNA and targeting them for degradation via the RNA exosome; the long isoform (ZAPL) is S-farnesylated and localizes to endolysosomes, while the short isoform (ZAPS) is a potent stimulator of RIG-I and STING signaling; ZAP recruits cofactors including KHNYN (an endoribonuclease) and associates with RNA granules/stress granules to execute antiviral RNA decay; beyond antiviral roles, ZAP regulates endogenous cellular mRNAs (e.g., destabilizing TRAILR4 to promote apoptosis and dampening cytokine production in T cells), inhibits LINE-1 and Alu retrotransposition, promotes NLRP3 inflammasome activation by facilitating NLRP3 oligomerization, and potentiates STING signaling by promoting STING oligomerization and ER-to-Golgi translocation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZC3HAV1 (ZAP/PARP13) is a CCCH-type zinc-finger RNA-binding protein that acts as a broad-spectrum cytosolic antiviral restriction factor and a regulator of endogenous RNA fate [#2, #1]. It directly binds viral and cellular transcripts through its four CCCH zinc-finger domains, preferentially recognizing CG- and cytosine-rich sequences, and targets bound RNA for exosome-dependent degradation [#7, #2]. This activity restricts diverse viruses including murine leukemia virus, SARS-CoV-2, HCMV, HTLV-1, and (for the porcine ortholog) PCV2, in each case by destabilizing specific viral mRNAs [#2, #6, #7, #8, #16]. ZAP localizes to cytoplasmic RNA/stress granules where it recruits exosome components and RNA-degradation machinery, and it inhibits LINE-1 and Alu retrotransposition by binding ORF1p in an RNA-dependent manner and degrading L1 RNA [#2, #3, #4]. Antiviral and decay functions depend on cofactor recruitment: ZAP interacts with the endonuclease KHNYN, whose cytoplasmic localization via its CUBAN-domain NES is required for the ZAP interaction and antiviral activity [#15], and associates with ZCCHC3 in linking the complex to the RNA exosome [#14]. The two isoforms are functionally specialized: the long isoform is S-farnesylated and targeted to endolysosomes, enhancing antiviral activity [#0]. Beyond viral defense, ZAP regulates endogenous mRNAs—destabilizing TRAILR4 to sensitize cells to TRAIL-mediated apoptosis [#1] and dampening cytokine (IFNG/TNF/IL2) production in T cells through 3' UTR binding [#12]—and it potentiates innate immune signaling by directly associating with STING to promote its oligomerization and ER-to-Golgi translocation [#10] and with NLRP3 to promote inflammasome activation [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Established that catalytically inactive PARP-13/ZAP participates in cytoplasmic poly(ADP-ribose) functions and stress granule assembly, placing ZAP in the cytoplasmic RNA-regulatory compartment.\",\n      \"evidence\": \"Biochemical fractionation, pADPr modification and stress granule assembly assays\",\n      \"pmids\": [\"22531498\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"ZAP's specific molecular contribution within pADPr functions not dissected\", \"no direct RNA target identified\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined ZAP's core antiviral mechanism: it acts as a cytosolic sensor that recruits viral RNA and exosome components to RNA granules for degradation, requiring its CCCH zinc-finger domains and operating independently of RIG-I-dependent IFN.\",\n      \"evidence\": \"ZAP-deficient mouse cells, viral replication assays, domain mutagenesis, co-localization, RNA granule fractionation\",\n      \"pmids\": [\"23836649\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"sequence determinants of viral RNA recognition not yet defined\", \"identity of exosome-recruiting cofactors unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Showed isoform-specific lipid modification controls ZAP localization: S-farnesylation of the long isoform targets it to endolysosomes and enhances antiviral activity, establishing ZAPL/ZAPS functional divergence.\",\n      \"evidence\": \"Bioorthogonal proteomics with alkyne-isoprenoid reporters, subcellular imaging, antiviral assay\",\n      \"pmids\": [\"23776219\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"how endolysosomal targeting mechanistically enhances RNA decay unclear\", \"structural basis of farnesylation-dependent membrane association not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended ZAP function to endogenous mRNA regulation by showing direct zinc-finger-mediated binding to the TRAILR4 3' UTR drives exosome-dependent decay, sensitizing cells to TRAIL apoptosis.\",\n      \"evidence\": \"RIP, siRNA knockdown, RNA stability and luciferase reporter assays, exosome inhibition\",\n      \"pmids\": [\"25382312\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"full set of endogenous mRNA targets not mapped\", \"cis-element recognized within the 3' UTR not defined at nucleotide resolution\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated ZAP restricts retrotransposition of L1, Alu and related elements by binding ORF1p in an RNA-dependent manner, degrading L1 RNA, and disrupting ribonucleoprotein integrity, with an interactome including MOV10 and RNA-degradation/chaperonin proteins.\",\n      \"evidence\": \"Co-IP/MS interactome, siRNA knockdown, retrotransposition assays, fluorescence microscopy (replicated across two labs)\",\n      \"pmids\": [\"25951186\", \"26001115\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"which interactome partners are functionally required not established\", \"mechanism distinguishing RNA decay vs. RNP disassembly unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Linked ZAP restriction to viral CG dinucleotide content using HTLV-1, supporting sequence-biased recognition as a restriction determinant.\",\n      \"evidence\": \"ZAP overexpression and siRNA knockdown, virus production assay, CAGE sequencing\",\n      \"pmids\": [\"31842935\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"direct ZAP binding to HTLV-1 RNA not shown\", \"causal link between CG content and degradation not directly tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Positioned ZC3HAV1 within the IFN circuit, showing it is IFN-induced and reciprocally amplifies IFN-β and inflammatory cytokine production to restrict IAV.\",\n      \"evidence\": \"siRNA knockdown, overexpression, viral replication and cytokine assays, IFNAR-deficient cells\",\n      \"pmids\": [\"32922375\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"mechanism by which ZAP boosts IFN-β production not defined\", \"direct viral RNA target in IAV not identified\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Confirmed direct binding to viral RNA at transcriptome scale: ZAP binds SARS-CoV-2 RNA and, via eCLIP, binds CG/cytosine-rich HCMV transcripts (UL4/UL5) it destabilizes, defining its sequence preference.\",\n      \"evidence\": \"RNP capture, eCLIP-seq, SLAM-seq, knockdown/overexpression with transcriptome and proteome readouts\",\n      \"pmids\": [\"33989516\", \"33947766\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"structural basis of CG-rich recognition not resolved\", \"why only a subset of CG-rich transcripts is targeted unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Resolved cofactor recruitment requirements, showing KHNYN's cytoplasmic localization (via its CUBAN-domain NES) is required for ZAP interaction and antiviral activity, and that ZCCHC3 associates with ZAP linking the complex to the RNA exosome.\",\n      \"evidence\": \"Co-IP, NES/CUBAN mutagenesis, subcellular localization, velocity gradient centrifugation, antiviral assays\",\n      \"pmids\": [\"36633408\", \"37405998\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"stoichiometry and architecture of the ZAP-KHNYN-ZCCHC3-exosome assembly unknown\", \"whether KHNYN provides endonucleolytic cleavage in this complex not directly shown here\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Broadened endogenous regulation to immune effector control, showing ZC3HAV1 binds cytokine (IFNG/TNF/IL2) 3' UTRs and dampens cytokine production duration in activated T cells.\",\n      \"evidence\": \"RNA aptamer-based capture, RBP-RNA mapping, T cell activation and cytokine assays\",\n      \"pmids\": [\"37074914\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"ZC3HAV1 one of >130 RBPs in the screen; specific contribution partly correlative\", \"decay vs. translational mechanism on cytokine mRNAs not separated\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed signaling-scaffold roles beyond RNA decay: ZAP directly promotes STING oligomerization and ER-to-Golgi translocation, and promotes NLRP3 oligomerization to drive inflammasome activation, with deficient mice showing reduced inflammation in vivo.\",\n      \"evidence\": \"Co-IP, oligomerization and translocation assays, Zc3hav1/Zap-deficient mice in HSV-1/DMXAA, alum peritonitis, and LPS sepsis models\",\n      \"pmids\": [\"39478149\", \"38663314\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"how an RNA-binding protein mechanistically nucleates STING/NLRP3 oligomerization unclear\", \"whether these protein-scaffolding roles require RNA binding not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ZAP integrates its dual identity—sequence-specific RNA-decay factor versus protein-protein scaffold for innate immune oligomerization—into a unified mechanism, and the structural basis of CG-rich RNA recognition, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"no structural model of ZAP-RNA recognition\", \"relationship between RNA-binding and scaffolding functions undefined\", \"rules governing which transcripts (viral vs. endogenous) are selected unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [1, 2, 6, 7, 16]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [1, 2, 7]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 3, 4]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [9, 10, 11, 12]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [1, 2, 7]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [10, 11]}\n    ],\n    \"complexes\": [\"RNA exosome (associated)\"],\n    \"partners\": [\"KHNYN\", \"ZCCHC3\", \"MOV10\", \"LINE-1 ORF1p\", \"STING1\", \"NLRP3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}